Description of problem:
Something to do with DRI. Will attach the server logs.
(II) AIGLX: Suspending AIGLX clients for VT switch
0: /usr/bin/Xorg(xf86SigHandler+0x65) [0x479fe5]
1: /lib64/libc.so.6 [0x3ce24322a0]
2: /usr/lib64/xorg/modules/extensions//libdri.so(DRILock+0x47) [0x7b838a7]
3: /usr/lib64/xorg/modules/drivers//intel_master_drv.so [0x6549a77]
4: /usr/bin/Xorg(AbortDDX+0x8d) [0x460acd]
5: /usr/bin/Xorg(AbortServer+0x18) [0x4f6048]
6: /usr/bin/Xorg(FatalError+0xd5) [0x4f6715]
8: /usr/lib64/xorg/modules/drivers//intel_master_drv.so(I830Sync+0x1b3) [0x6540223]
9: /usr/lib64/xorg/modules//libexa.so(exaWaitSync+0x8c) [0x3bef36c]
10: /usr/lib64/xorg/modules//libexa.so(ExaDoPrepareAccess+0xa5) [0x3bf0935]
11: /usr/lib64/xorg/modules//libexa.so [0x3bf1c68]
12: /usr/lib64/xorg/modules//libexa.so(exaShmPutImage+0x165) [0x3bf26e5]
13: /usr/bin/Xorg [0x506c87]
14: /usr/bin/Xorg [0x5080b5]
15: /usr/bin/Xorg(Dispatch+0x364) [0x446394]
16: /usr/bin/Xorg(main+0x45d) [0x42c87d]
17: /lib64/libc.so.6(__libc_start_main+0xfa) [0x3ce241e32a]
18: /usr/bin/Xorg(FontFileCompleteXLFD+0x279) [0x42bc59]
Version-Release number of selected component (if applicable):
Every time. Reproduced on both i965 and i945.
Steps to Reproduce:
1. Log in
2. f-u-s to another user
3. Attempt to f-u-s back to the first user
The first X server crashes. Display is trashed, HW state is fubar, you can no
longer start any X servers without rebooting.
A working switch.
Created attachment 308483 [details]
X log from the first server started (which crashed)
Created attachment 308484 [details]
X log from the second server started
This bug looks similar:
Just a note that there are now several similar reports with different hardware: Bug 482997, Bug 484516, Bug 450197, and Bug 439294.
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Now no longer crashes.